Melting kettle for tar, asphalt, and the like



MELTING KETTLE FOR TAR, ASPHALT, AND THE LIKE ATTORNEY,

Sept. 14, 1937. R. s. COULTER MELTING KETTLE FOR TAR, ASPHALT, AND THE LIKE Filed June 5, 193s 3 Sheets-Sheet 2 lNvENToR. ROA/MD5 Cal/L TER Spt- 14, 1937. u R. s. COULTER 2,093,232

MELTING KETTLE FOR TAR, ASPHALT', AND THE LIKE Filed June 5, 1956 3 Sheets-Sheet 5 N an E i E INVENTOR. RONALD 5. Col/L TER ATTORNEY.

Patented Sept. l14, 19,37v

PATENT OFFICE f Mamma name roal'rAa, ASPHALT, AND

:ma una Ronald S. Coulter, Roselle Park, N. J., assignor to Hauck Manufacturing Company,

Brooklyn,

N. Y., a corporation oi' New York 4 Application June 5, 193s, serial No. 83,641

5 Claims.

The invention relates to melting apparatus, more particularly to melting kettles for tar, asphalt and the like, and such as are designed usually for highway maintenance,I paving, roofing and waterprooiing and like operations.

It has for an object the provision of a kettle of this type which may be operated at high thermal eiciency and wherein the material may be more rapidly and eiectively heated and melted than in kettles as ordinarily constructed; also, to so construct a kettle that coking due generally to overheating of the kettle bottom is minimized and accumulation of foreign matter thereon substantially obviated, thereby affording a kettle giving longer and more uniform service.

A further object of the invention is to avoid ignition of heated vapors arising from the more or less liqueiied 'mass through discharge of the spent heating gases; also, to maintain at the same time a suitable temperature at the outlet end of the kettle so that the molten material may readily be dispensed through a suitable outlet nozzle.

IStill another object of the invention resides in the provision of a heating zone longitudinally of the kettle and beneath the bottom thereof; also, to so construct the same that it may conveniently be detached as for cleaning oi any accumulated deposits. These objects are attained in the novel construction which embodies a suitably shaped receptacle or kettle open at the top for loading of the material to be melted but provided with suitable lids for closing the kettle during the melting operation.

There is retained within this kettle va. specially designed heating flue which becomes substantially immersed as a whole in the molten material, and this flue terminates at the burner end within the kettle in a U-shaped header or manifold from which the collected heated gases are delivered to a further ue extending longitudinally of the kettle but located beneath the bottom thereof.

'I'his longitudinal flue, in turn, is extended upwardly through the bottom and is provided near the top of the kettle with a discharge opening for disposal of the spent gases. Moreover, the melted material discharge pipe from the bottom of the kettle is arranged to pass through this discharge ue, whereby the routgoing melted material is maintained in a suiilciently iiuld state at the point of discharge'for ready dispensing;

and an auxiliary discharge outlet'ior spent gases is provided about the spigot oi the discharge pipe to further maintain uidity tothe actual point ofdischarge. Theprovision of the flue beneath the bottom of the kettle, together with a drain arrangement in connection with the discharge of the material insures that the kettle may be completely drained and caking and accumulation of material on the bottom obvlated upon shutting down of the apparatus.

The nature of the invention, however, will best lbe understood when described in connection with the accompanying drawings, in which:

Fig. l is a vertical section taken through the novel melting kettle.

Fig. 2 is a horizontal sectionatherethroughy taken on the line 2-2, Fig. 1 of the drawings, and looking in the direction of the arrows.

Fig. 3 is a vertical section taken on the line 3 3, Fig. 1 of the drawings, and looking in the direction of the arrows.

Fig. 4 is a front elevation and part transverse section of the novel kettle.

Referring to the drawings, III designates a metal shell or more or less elongated receptacle with rounded bottom II and open at the top I2. This top, however, is designed to be closed by means, for example, of a pair of hinged lids or covers I3 which are closed after illling of the receptacle with material to be melted. The kettle is mounted upon a suitable trame-work I5 which may be provided with pairs oi handles I6 and Il at its opposite ends for manually transporting the same from place to place, as required; or wheels, or like meas (not shown), may be applied thereto. l

The frame I5 is designed also to carry `a suit-vv able buner apparatus indicated at I8 for providing ame and heated gases not directly -into the kettle or receptacle, as is the usual practice, but into an immersed melting member embodying the longitudinally extending flue member 20 which is located near the bottom of the kettle and extends substantially from end to end with the near end provided with an opening 2| juxtaposed to the outlet of burner I8. At the far end. the flue divides into two arms 22-and 23 through a |'connection 24; and the said arms v22 and 23 parallel the ilue portion 20 to the burner end of the kettle. At'this end, theyterminate in a. U-shaped header or tube sheet 25 which, in turn, communicates through the opening 25 with a further and discharge flue 21V located beneath the bottom II o! the kettle where the circulation of molten material has a tendency to'become sluggish. At the far end of the kettle, miel-i1v penes tmwgn the betteln' thereof tmned'upwardiy substantially to the top of'thesame and provided with adn-t J charge portion 2l from which the spent gases iseelivercdinto the atmosphere out- A-discharge chamber Il for the molten material is provided at the far end of the kettle and a the bottom of the elbow substantially at tho level of the tank bottom. An auxiliaryspent gas discharge outlet 32' is provided inthe iiue Il and kettle wall about pipe portion 3l to assist in maintaining the spigot 'I2 at the required temperature. This will insure not only a suitable temperature of the spigot and (portion of thekettle in the vicinity thereof so that rapid and satisfactory discharge of the molten material is had, but that no diillculty will be experienced in the manipulation of the spigot member.

Moreover; in the provision of the discharge flue beneath the normally colder zone along the kettle bottom, ow of the material will better be main. tained and it may be substantially drained from the tank; or, if there be any accumulation, this will rapidly be melted at starting of the melting operation so that a rapid melt is attained and molten material is quickly available. This external flue portion located beneath the kettle bottom is preferably made to be readily removable therefrom for cleaning purposes; and to this end, it may beconstructed as a box plate to be inserted yat one end into the header outlet 2t and attached by bolts and nuts (not shown), for example, to angle pieces 38 extending longitudinally over the bottom of the kettle.

.I claim:

1. A melting kettle for tar, asphalt and the like, comprising a receptacle provided with an opening at' the top to receive the material to be melted, a heating ilue mounted within the kettle for immersion in the molten material and comprising a duct with opening at one end and said duct extending longitudinally through the kettle near the bottom thereof vand aifording a pair of return flues in communication therewith. a burner to introduce a heating medium into the opening of said longitudinal duct, a header within the kettle at the burner end and in which said return flues terminate, and a discharge flue extending llongitudinally along and beneath the bottom of the kettle to its discharge end, communicating with said header and having an outlet to the atmosphere at said discharge end.

2. A melting kettle for tar, asphalt and the like, comprising a receptacle provided with anl .return ilues in communicationv therewith. a

aooaasa g y to introduce a heating medium into the opening or nld'longituolnal duet. a u-.haped header extending downwardly below the bottom `o! the kettle at the burner end and in which saldreturn fiues terminate, and"` a discharge iiue communicating with the bottom of vthe header and extending longitudinally along and beneath the lbottom of the kettle. Y v

- 3. A melting kettle for tar, asphalt and th like, 4.mnprising a receptacle provided with an opening-at the` topt'o receive` the material to be melted, a heating flue mounted within the kettle for immersion in the molten material and com' nues terminate, and a discharge flue communi- Y cating with the bottom of the header, removably attached thereto and extending longitudinally along and beneath the bottom of the kettle.

4. A melting kettle for tar, asphalt and the like, comprising a receptacle provided with an opening at the top to receive the material to be melted. a heating flue mounted within the kettle for immersion in the molten material and comprising a duct with opening at one end and said duct extending longitudinally through the kettle near the bottom thereof .and affording a pair of return ilues in communication therewith, a burner to introduce a heating medium into the opening of said longitudlnalduct, a header within the kettle at the burner en d and in which said return fines terminate, a discharge flue extending longitudinally along vand beneath the bottom of the kettle to its discharge end, communicating with said header and having an outlet to the atmosphere at said discharge end, and means for discharging molten material from the bottom of the kettle and embodying a pipe extending through said discharge ilue, there being a further `discharge outlet from the discharge ue and about said discharge pipe.

5. A melting kettle for tar. Iasphalt and the like, comprising a receptacle provided with an opening at the top to receive the material to be melted,` a heating ilue mounted within the kettle for immersion in the molten material and comprising a duct with opening at one end and said duct extending longitudinally through the kettle near the bottom thereof and affording a pair of return ilues in communication therewith, a

burner to introduce a heating medium into the` opening of said longitudinal duct, a header within the kettle at the burner end and in which said return ilues terminate, and a discharge ue extending longitudinally along and beneath the bottom ofthe kettle to its discharge end, communicating with said header and having an outlet to the atmosphere at said discharge end, said kettle being provided with a discharge. chamber at its far end through which an upward extension of the discharge flue extends, and discharge means for molten material and vincluding apipe communicating with said chamber and extending through said discharge flue.

. RONALD S. COULTER. 

